WILMINGTON, CA, USA
N92252
CESSNA 182N
DURING A LOCAL NIGHT INSTRUCTIONAL FLT THE PLTS REPORTED THAT THE ENG BEGAN TO RUN VERY ROUGH AND EVENTUALLY QUIT WHEN POWER WAS REDUCED SLIGHTLY TO BEGIN THE DESCENT FOR THE DESTINATION ARPT. THE ACFT STRUCK POWER LINES, TWO SMALL BUILDINGS AND A BRICK WALL DURING THE NIGHT FORCED LANDING IN AN INDUSTRIAL AREA. EXAMINATION OF THE ENG REVEALED THAT THE NUMBER ONE CYLINDER EXHAUST VALVE ROCKER ARM SHAFT BOSS JOURNAL HAD FAILED. TESTS OF AN IDENTICAL ENG DUPLICATING THE BOSS JOURNAL FAILURE IN A TEST CELL REPLICATED THE ENG POWER LOSS AS DESCRIBED BY THE CREW. THE CYLINDER HAD BEEN CHANGED 27 HOURS PRIOR TO THE ACCIDENT. EVIDENCE INDICATED THAT THE ROCKER ARM SHAFT KEEPER BOLT HAD BEEN OVER TORQUED DURING THE OVERHAUL.
Source: NTSB Aviation Accident Database
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